import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int num = scan.nextInt();
        scan.close();

        //write code here......
        int sum = 0;
        if(num>0) {
            while(num>0) {
                sum++;
                num/=10;
            }
            System.out.println(sum);
        }else {
            System.out.println(num);
        }

    }
}